Honestly, even though this is probably THE most given piece of advice, this book has helped me a ton. Two years ago, I felt stuck at about the same point. 5.11a/b. After ingraining the principles and breaking just a couple bad habits, I sent my first 2 5.12a's and onsighted my first 5.11a.

I would even break the book down further and focus on the book in 1/3's.

Read and fully understand the first 1/3 of the book: Technique & Body Awareness. Don't be tempted to move on until it is second nature.

The book is a combination of Common Sense & Science. But most importantly, Application.